package com.itheima.reggie.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.update.LambdaUpdateWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.itheima.reggie.common.R;
import com.itheima.reggie.dto.DishDto;
import com.itheima.reggie.entity.Category;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.DishFlavor;
import com.itheima.reggie.service.CategoryService;
import com.itheima.reggie.service.DishFlavorService;
import com.itheima.reggie.service.DishService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.web.bind.annotation.*;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;

/**
 * 菜品管理
 */
@RestController
@RequestMapping("/dish")
@Slf4j
public class DishController {

    @Autowired
    private DishService dishService;

    @Autowired
    private DishFlavorService dishFlavorService;

    @Autowired
    private CategoryService categoryService;

    @Autowired
    private RedisTemplate redisTemplate;

    /**
     * 新增菜品
     *
     * @param dishDto
     * @return
     */
    @PostMapping
    public R<String> save(@RequestBody DishDto dishDto) {
        log.info(dishDto.toString());

        dishService.saveWithFlavor(dishDto);

        //清理所有菜品的缓存数据
        Set keys = redisTemplate.keys("dish_*"); //获取所有以dish_xxx开头的key
        redisTemplate.delete(keys); //删除这些key
     /*   //清理某个分类下面的菜品缓存数据
        String key = "dish_" + dishDto.getCategoryId() + "_1";
        redisTemplate.delete(key);*/

        return R.success("新增菜品成功");
    }

    /**
     * 菜品信息分页查询
     *
     * @param page
     * @param pageSize
     * @param name
     * @return
     */
    @GetMapping("/page")
    public R<Page> page(int page, int pageSize, String name) {
        //构造分页构造器对象
        Page<Dish> pageInfo = new Page<>(page, pageSize);

        //条件构造器
        LambdaQueryWrapper<Dish> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.like(name != null, Dish::getName, name);
        queryWrapper.orderByDesc(Dish::getUpdateTime);

        //执行分页查询
        dishService.page(pageInfo, queryWrapper);

        //获取分页查询的列表数据
        List<Dish> records = pageInfo.getRecords();

        //1)如果没有查询到符合条件的数据,直接返回
        if (records.size() == 0) {
            return R.success(pageInfo);
        }

        //2)获取所有的分类信息
        Set<Long> categoryIds = records.stream().map(dish -> dish.getCategoryId())
                .collect(Collectors.toSet());
        List<Category> categoryList = categoryService.listByIds(categoryIds);

        //3)获取 CategoryId  和  CategoryName 的对应关系
        Map<Long, String> categoryMap = categoryList.stream()
                .collect(Collectors.toMap(Category::getId, Category::getName));

        //4)循环遍历给CategoryName赋值
        for (Dish dish : records) {
            Long categoryId = dish.getCategoryId();
            String categoryName = categoryMap.get(categoryId);
            dish.setCategoryName(categoryName);
        }

        return R.success(pageInfo);
    }

    /**
     * 根据id查询菜品信息和对应的口味信息
     *
     * @param id
     * @return
     */
    @GetMapping("/{id}")
    public R<DishDto> get(@PathVariable Long id) {

        DishDto dishDto = dishService.getByIdWithFlavor(id);

        return R.success(dishDto);
    }

    /**
     * 修改菜品
     *
     * @param dishDto
     * @return
     */
    @PutMapping
    public R<String> update(@RequestBody DishDto dishDto) {
        log.info(dishDto.toString());

        dishService.updateWithFlavor(dishDto);

        //清理某个分类下面的菜品缓存数据
        String key = "dish_" + dishDto.getCategoryId() + "_1";
        redisTemplate.delete(key);

        return R.success("修改菜品成功");
    }

    /**
     * 根据条件查询对应的菜品数据
     *
     * @param dish
     * @return
     */
    @GetMapping("/list")
    public R<List<DishDto>> list(Dish dish) {

        List<DishDto> dishDtoList = null;
            //动态构造key
        String key = "dish_" + dish.getCategoryId() + "_" + dish.getStatus();//dish_1397844391040167938_1
        //先从redis中获取缓存数据
        dishDtoList = (List<DishDto>) redisTemplate.opsForValue().get(key);
        if(dishDtoList != null){
            //如果存在，直接返回，无需查询数据库
            return R.success(dishDtoList);
        }

        //构造查询条件
        LambdaQueryWrapper<Dish> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(dish.getCategoryId() != null, Dish::getCategoryId, dish.getCategoryId());
        //添加条件，查询状态为1（起售状态）的菜品
        queryWrapper.eq(Dish::getStatus, 1);
        //添加排序条件
        queryWrapper.orderByAsc(Dish::getSort).orderByDesc(Dish::getUpdateTime);

        List<Dish> dishList = dishService.list(queryWrapper);

        dishDtoList = new ArrayList<>();
        for (Dish item : dishList) {
            DishDto dishDto = new DishDto();
            BeanUtils.copyProperties(item, dishDto);

            //当前菜品的id
            Long dishId = item.getId();

            //设置查询条件
            LambdaQueryWrapper<DishFlavor> lambdaQueryWrapper = new LambdaQueryWrapper<>();
            lambdaQueryWrapper.eq(DishFlavor::getDishId, dishId);

            //SQL:select * from dish_flavor where dish_id = ?
            List<DishFlavor> dishFlavorList = dishFlavorService.list(lambdaQueryWrapper);

            dishDto.setFlavors(dishFlavorList);

            dishDtoList.add(dishDto);
        }
        //如果不存在，需要查询数据库，将查询到的菜品数据缓存到Redis
        redisTemplate.opsForValue().set(key,dishDtoList,60, TimeUnit.MINUTES);

        return R.success(dishDtoList);
    }


    /**
     * 批量删除菜品信息和对应的口味信息
     *
     * @param ids
     * @return
     */
    @DeleteMapping
    public R delete(@RequestParam List<Long> ids) {
        dishService.removeWithFlavor(ids);
        return R.success("删除成功");
    }


    /**
     * 批量起售、停售菜品
     *
     * @param status
     * @param ids
     * @return
     */
    @PostMapping("/status/{status}")
    public R updateStatus(@PathVariable Integer status, @RequestParam List<Long> ids) {

        LambdaUpdateWrapper<Dish> updateWrapper = new LambdaUpdateWrapper<>();
        updateWrapper.set(Dish::getStatus, status);
        updateWrapper.in(Dish::getId, ids);

        //SQL: UPDATE dish SET status=? WHERE id IN (?,?,.....)
        dishService.update(updateWrapper);
        return R.success("修改成功");
    }

}
